3 #include "bkey_methods.h"
4 #include "btree_update.h"
11 #include <linux/random.h>
13 #include <asm/unaligned.h>
15 #define FIELD_BYTES() \
17 static const u8 byte_table[8] = { 1, 2, 3, 4, 6, 8, 10, 13 };
18 static const u8 bits_table[8] = {
29 static int inode_encode_field(u8 *out, u8 *end, u64 hi, u64 lo)
31 __be64 in[2] = { cpu_to_be64(hi), cpu_to_be64(lo), };
32 unsigned shift, bytes, bits = likely(!hi)
36 for (shift = 1; shift <= 8; shift++)
37 if (bits < bits_table[shift - 1])
42 bytes = byte_table[shift - 1];
44 BUG_ON(out + bytes > end);
46 memcpy(out, (u8 *) in + 16 - bytes, bytes);
47 *out |= (1 << 8) >> shift;
52 static int inode_decode_field(const u8 *in, const u8 *end,
53 u64 out[2], unsigned *out_bits)
55 __be64 be[2] = { 0, 0 };
56 unsigned bytes, shift;
66 * position of highest set bit indicates number of bytes:
67 * shift = number of bits to remove in high byte:
69 shift = 8 - __fls(*in); /* 1 <= shift <= 8 */
70 bytes = byte_table[shift - 1];
75 p = (u8 *) be + 16 - bytes;
77 *p ^= (1 << 8) >> shift;
79 out[0] = be64_to_cpu(be[0]);
80 out[1] = be64_to_cpu(be[1]);
81 *out_bits = out[0] ? 64 + fls64(out[0]) : fls64(out[1]);
86 void bch2_inode_pack(struct bkey_inode_buf *packed,
87 const struct bch_inode_unpacked *inode)
89 u8 *out = packed->inode.v.fields;
90 u8 *end = (void *) &packed[1];
91 u8 *last_nonzero_field = out;
92 unsigned nr_fields = 0, last_nonzero_fieldnr = 0;
94 bkey_inode_init(&packed->inode.k_i);
95 packed->inode.k.p.inode = inode->bi_inum;
96 packed->inode.v.bi_hash_seed = inode->bi_hash_seed;
97 packed->inode.v.bi_flags = cpu_to_le32(inode->bi_flags);
98 packed->inode.v.bi_mode = cpu_to_le16(inode->bi_mode);
100 #define BCH_INODE_FIELD(_name, _bits) \
101 out += inode_encode_field(out, end, 0, inode->_name); \
104 if (inode->_name) { \
105 last_nonzero_field = out; \
106 last_nonzero_fieldnr = nr_fields; \
110 #undef BCH_INODE_FIELD
112 out = last_nonzero_field;
113 nr_fields = last_nonzero_fieldnr;
115 set_bkey_val_bytes(&packed->inode.k, out - (u8 *) &packed->inode.v);
117 (u8 *) &packed->inode.v +
118 bkey_val_bytes(&packed->inode.k) - out);
120 SET_INODE_NR_FIELDS(&packed->inode.v, nr_fields);
122 if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG)) {
123 struct bch_inode_unpacked unpacked;
125 int ret = bch2_inode_unpack(inode_i_to_s_c(&packed->inode),
128 BUG_ON(unpacked.bi_inum != inode->bi_inum);
129 BUG_ON(unpacked.bi_hash_seed != inode->bi_hash_seed);
130 BUG_ON(unpacked.bi_mode != inode->bi_mode);
132 #define BCH_INODE_FIELD(_name, _bits) BUG_ON(unpacked._name != inode->_name);
134 #undef BCH_INODE_FIELD
138 int bch2_inode_unpack(struct bkey_s_c_inode inode,
139 struct bch_inode_unpacked *unpacked)
141 const u8 *in = inode.v->fields;
142 const u8 *end = (void *) inode.v + bkey_val_bytes(inode.k);
144 unsigned fieldnr = 0, field_bits;
147 unpacked->bi_inum = inode.k->p.inode;
148 unpacked->bi_hash_seed = inode.v->bi_hash_seed;
149 unpacked->bi_flags = le32_to_cpu(inode.v->bi_flags);
150 unpacked->bi_mode = le16_to_cpu(inode.v->bi_mode);
152 #define BCH_INODE_FIELD(_name, _bits) \
153 if (fieldnr++ == INODE_NR_FIELDS(inode.v)) { \
154 memset(&unpacked->_name, 0, \
155 sizeof(*unpacked) - \
156 offsetof(struct bch_inode_unpacked, _name)); \
160 ret = inode_decode_field(in, end, field, &field_bits); \
164 if (field_bits > sizeof(unpacked->_name) * 8) \
167 unpacked->_name = field[1]; \
171 #undef BCH_INODE_FIELD
173 /* XXX: signal if there were more fields than expected? */
178 static const char *bch2_inode_invalid(const struct bch_fs *c,
182 return "nonzero offset";
186 struct bkey_s_c_inode inode = bkey_s_c_to_inode(k);
187 struct bch_inode_unpacked unpacked;
189 if (bkey_val_bytes(k.k) < sizeof(struct bch_inode))
190 return "incorrect value size";
192 if (k.k->p.inode < BLOCKDEV_INODE_MAX)
193 return "fs inode in blockdev range";
195 if (INODE_STR_HASH(inode.v) >= BCH_STR_HASH_NR)
196 return "invalid str hash type";
198 if (bch2_inode_unpack(inode, &unpacked))
199 return "invalid variable length fields";
201 if (unpacked.bi_data_checksum >= BCH_CSUM_OPT_NR + 1)
202 return "invalid data checksum type";
204 if (unpacked.bi_compression >= BCH_COMPRESSION_OPT_NR + 1)
205 return "invalid data checksum type";
209 case BCH_INODE_BLOCKDEV:
210 if (bkey_val_bytes(k.k) != sizeof(struct bch_inode_blockdev))
211 return "incorrect value size";
213 if (k.k->p.inode >= BLOCKDEV_INODE_MAX)
214 return "blockdev inode in fs range";
217 case BCH_INODE_GENERATION:
218 if (bkey_val_bytes(k.k) != sizeof(struct bch_inode_generation))
219 return "incorrect value size";
223 return "invalid type";
227 static void bch2_inode_to_text(struct bch_fs *c, char *buf,
228 size_t size, struct bkey_s_c k)
230 char *out = buf, *end = out + size;
231 struct bkey_s_c_inode inode;
232 struct bch_inode_unpacked unpacked;
236 inode = bkey_s_c_to_inode(k);
237 if (bch2_inode_unpack(inode, &unpacked)) {
238 out += scnprintf(out, end - out, "(unpack error)");
242 #define BCH_INODE_FIELD(_name, _bits) \
243 out += scnprintf(out, end - out, #_name ": %llu ", (u64) unpacked._name);
245 #undef BCH_INODE_FIELD
250 const struct bkey_ops bch2_bkey_inode_ops = {
251 .key_invalid = bch2_inode_invalid,
252 .val_to_text = bch2_inode_to_text,
255 void bch2_inode_init(struct bch_fs *c, struct bch_inode_unpacked *inode_u,
256 uid_t uid, gid_t gid, umode_t mode, dev_t rdev,
257 struct bch_inode_unpacked *parent)
259 s64 now = timespec_to_bch2_time(c,
260 timespec_trunc(current_kernel_time(),
261 c->sb.time_precision));
263 memset(inode_u, 0, sizeof(*inode_u));
266 inode_u->bi_flags |= c->opts.str_hash << INODE_STR_HASH_OFFSET;
267 get_random_bytes(&inode_u->bi_hash_seed, sizeof(inode_u->bi_hash_seed));
269 inode_u->bi_mode = mode;
270 inode_u->bi_uid = uid;
271 inode_u->bi_gid = gid;
272 inode_u->bi_dev = rdev;
273 inode_u->bi_atime = now;
274 inode_u->bi_mtime = now;
275 inode_u->bi_ctime = now;
276 inode_u->bi_otime = now;
279 #define BCH_INODE_FIELD(_name) inode_u->_name = parent->_name;
280 BCH_INODE_FIELDS_INHERIT()
281 #undef BCH_INODE_FIELD
285 int bch2_inode_create(struct bch_fs *c, struct bch_inode_unpacked *inode_u,
286 u64 min, u64 max, u64 *hint)
288 struct bkey_inode_buf inode_p;
289 struct btree_iter iter;
290 bool searched_from_start = false;
296 if (c->opts.inodes_32bit)
297 max = min_t(u64, max, U32_MAX);
299 if (*hint >= max || *hint < min)
303 searched_from_start = true;
305 bch2_btree_iter_init(&iter, c, BTREE_ID_INODES, POS(*hint, 0),
306 BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
309 struct bkey_s_c k = bch2_btree_iter_peek_slot(&iter);
310 u32 bi_generation = 0;
312 ret = btree_iter_err(k);
314 bch2_btree_iter_unlock(&iter);
319 case BCH_INODE_BLOCKDEV:
322 if (iter.pos.inode == max)
325 bch2_btree_iter_next_slot(&iter);
328 case BCH_INODE_GENERATION: {
329 struct bkey_s_c_inode_generation g =
330 bkey_s_c_to_inode_generation(k);
331 bi_generation = le32_to_cpu(g.v->bi_generation);
335 inode_u->bi_generation = bi_generation;
337 bch2_inode_pack(&inode_p, inode_u);
338 inode_p.inode.k.p = k.k->p;
340 ret = bch2_btree_insert_at(c, NULL, NULL, NULL,
342 BTREE_INSERT_ENTRY(&iter,
343 &inode_p.inode.k_i));
346 bch2_btree_iter_unlock(&iter);
350 inode_p.inode.k.p.inode;
351 *hint = inode_p.inode.k.p.inode + 1;
363 bch2_btree_iter_unlock(&iter);
365 if (!searched_from_start) {
366 /* Retry from start */
368 searched_from_start = true;
375 int bch2_inode_truncate(struct bch_fs *c, u64 inode_nr, u64 new_size,
376 struct extent_insert_hook *hook, u64 *journal_seq)
378 return bch2_btree_delete_range(c, BTREE_ID_EXTENTS,
379 POS(inode_nr, new_size),
380 POS(inode_nr + 1, 0),
381 ZERO_VERSION, NULL, hook,
385 int bch2_inode_rm(struct bch_fs *c, u64 inode_nr)
387 struct btree_iter iter;
388 struct bkey_i_inode_generation delete;
391 ret = bch2_inode_truncate(c, inode_nr, 0, NULL, NULL);
395 ret = bch2_btree_delete_range(c, BTREE_ID_XATTRS,
397 POS(inode_nr + 1, 0),
398 ZERO_VERSION, NULL, NULL, NULL);
403 * If this was a directory, there shouldn't be any real dirents left -
404 * but there could be whiteouts (from hash collisions) that we should
407 * XXX: the dirent could ideally would delete whiteouts when they're no
410 ret = bch2_btree_delete_range(c, BTREE_ID_DIRENTS,
412 POS(inode_nr + 1, 0),
413 ZERO_VERSION, NULL, NULL, NULL);
417 bch2_btree_iter_init(&iter, c, BTREE_ID_INODES, POS(inode_nr, 0),
418 BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
420 struct bkey_s_c k = bch2_btree_iter_peek_slot(&iter);
421 u32 bi_generation = 0;
423 ret = btree_iter_err(k);
425 bch2_btree_iter_unlock(&iter);
429 bch2_fs_inconsistent_on(k.k->type != BCH_INODE_FS, c,
430 "inode %llu not found when deleting",
435 struct bch_inode_unpacked inode_u;
437 if (!bch2_inode_unpack(bkey_s_c_to_inode(k), &inode_u))
438 bi_generation = inode_u.bi_generation + 1;
441 case BCH_INODE_GENERATION: {
442 struct bkey_s_c_inode_generation g =
443 bkey_s_c_to_inode_generation(k);
444 bi_generation = le32_to_cpu(g.v->bi_generation);
449 if (!bi_generation) {
450 bkey_init(&delete.k);
451 delete.k.p.inode = inode_nr;
453 bkey_inode_generation_init(&delete.k_i);
454 delete.k.p.inode = inode_nr;
455 delete.v.bi_generation = cpu_to_le32(bi_generation);
458 ret = bch2_btree_insert_at(c, NULL, NULL, NULL,
461 BTREE_INSERT_ENTRY(&iter, &delete.k_i));
462 } while (ret == -EINTR);
464 bch2_btree_iter_unlock(&iter);
468 int bch2_inode_find_by_inum(struct bch_fs *c, u64 inode_nr,
469 struct bch_inode_unpacked *inode)
471 struct btree_iter iter;
475 for_each_btree_key(&iter, c, BTREE_ID_INODES,
477 BTREE_ITER_SLOTS, k) {
480 ret = bch2_inode_unpack(bkey_s_c_to_inode(k), inode);
483 /* hole, not found */
491 return bch2_btree_iter_unlock(&iter) ?: ret;
494 #ifdef CONFIG_BCACHEFS_DEBUG
495 void bch2_inode_pack_test(void)
497 struct bch_inode_unpacked *u, test_inodes[] = {
504 .bi_sectors = U64_MAX,
508 .bi_generation = U32_MAX,
513 for (u = test_inodes;
514 u < test_inodes + ARRAY_SIZE(test_inodes);
516 struct bkey_inode_buf p;
518 bch2_inode_pack(&p, u);